Quote:
Originally Posted by cbl117
I've searched and this was the only thread I could find on this question...
If I have a N54 135i, is it worth swapping my downpipes for 1M downpipes to gain performance, not have a CEL and pass emmisions?
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If you can find them cheap. You will likely gain about 10 hp by the switch. The alternative is just to save the money and put it towards a cat-back exhaust, intake of a proper software flash for the car.